and michelle obama, jason wu, red dress there. and we have this other picture. you see katy perry and john mayer looking -- they were having a good time. >> nothing going on there. >> apparently michelle obama was dancing to beyonce's big hit "single lady" and get this, they said there was a report at the party that usher and the president got into a "gangnam style" dance-off. but still no reports on who actually won. >> i hope we have pictures or video of that. >> katy perry tweeted, just left the white house. all other parties from here on out will be judged. and kelly clarkson, who performed, wrote just partied at the white house. i kid you not, michelle obama stood up and got the party started. seriously cool first lady. they had a good time. >> i'm jealous about that one. >>> check this out. remember all those boy bands? who didn't love them? new kids on the block, boyz ii men, 98 degrees, all going on tour. yes, they're all going on tour. the package tour is scheduled to kick off may 31st in connecticut. it's going to travel across the country, wrapping ju